GOP Needs to Fight Obama, Not Each Other: Trump

It's time for the Republican presidential candidates to stop fighting each other and take on President Barack Obama, real-estate mogul Donald Trump told CNBC Tuesday.

Donald Trump

He no longer believes it is better for the Republican candidates to fight each other to get voters talking about them, he said.

"They have been doing a lot of talking for a lot of time about each other and not about the president, and it’s now really time to focus and get everybody in line. The Republicans have to show some leadership," said Trump, who did not specifically name Rick Santorumand Newt Gingrich.

Trump backsMitt Romney, and predicted the former Massachusetts governor will have a "surprisingly good" night during the Super Tuesdayprimaries.

The head of the Trump Organization said he has been making automated phone calls, or "robocalls," and doing radio interviews on Romney's behalf in the key state of Ohio.

Romney "gets China, he gets OPEC, he gets what's going on. I think the others don't," said Trump, who has long criticized the Obama administration for lack of leadership in allowing China to "make patsies of us" and for not fighting OPECas its leaders raise the price of oil.

Trump wouldn't comment on what he would do in a Romney administration, instead saying, "I love real estate in light of what's going on in the world." With European uncertainty and high U.S. debt, "the best hedge is real estate," he said.